Odpowiedzi

2009-06-12T11:54:43+02:00
(-5x+3y+2)*3-2(-3x+4y+2)
(-5*[-3]+3*[-2]+2)*3-2*(-3*[-3]+4*[-2]+2)= (15-6+2)*3-2*(9-8+2)= 11*3-2*3=33-6=27

(18x-12y+24):(-6)+3(2x-3y+1)
(18*[-3]-12*[-2]+24):(-6)+3*(2*[-3]-3*[-2]+1) = (-54+24+24):(-6)+3*(-6+6+1)= (-6):(-6)+3*1=1+3=4

(x+2y-1)*5-(10x+5y-15) :(5)
(-3+2*[-2]-1)*5-(10*[-3]+5*[-2]-15):5= (-3-4-1)*5-(-30-10-15):5= (-8)*5-(-55):5=-40+11= -29